<script setup lang="ts">
import { computed, ref, watch } from "vue";

// 定义水果对象的类型
interface Fruit {
  id: number;
  icon: string;
  isChecked: boolean;
  num: number;
  price: number;
}
// function getfruitList(){
//   if(  localStorage.getItem("list") === null){
//     return defaultList.value
//   }else{
//     return JSON.parse(localStorage.getItem("list") || "[]")
//   }
// }
// const fruitList=ref<Fruit[]>(getfruitList())
// 水果列表
const defaultList = ref<Fruit[]>([
  {
    id: 1,
    icon: "https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/ll.png",
    isChecked: true,
    num: 2,
    price: 6,
  },
  {
    id: 2,
    icon: "https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/smt.png",
    isChecked: false,
    num: 7,
    price: 20,
  },
  {
    id: 3,
    icon: "https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/tg.png",
    isChecked: false,
    num: 3,
    price: 40,
  },
  {
    id: 4,
    icon: "https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/xg.png",
    isChecked: false,
    num: 10,
    price: 3,
  },
  {
    id: 5,
    icon: "https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/yl.png",
    isChecked: false,
    num: 20,
    price: 34,
  },
]);
//若持久化中没有存储数据，才读取默认值，若有则用持久化的
const fruitList =
  localStorage.getItem("list") === null
    ? ref<Fruit[]>(defaultList.value)
    : ref<Fruit[]>(JSON.parse(localStorage.getItem("list") || "[]"));
watch(
  fruitList,
  () => {
    localStorage.setItem("list", JSON.stringify(fruitList.value));
  },
  { deep: true }
);
 
//删除水果
const deleteFruir = (id: number) => {
  // 通过 id 删除数据
  // 通过 filter 过滤，返回新的数组
  fruitList.value = fruitList.value.filter((item) => item.id !== id);
};
//减少水果
const decreaseFruit = (id: number) => {
  const activeItem = fruitList.value.find((item) => item.id == id);
  if (activeItem) {
    activeItem.num--;
  }
};
//增加水果
const increaseFruit = (id: number) => {
  const activeItem = fruitList.value.find((item) => item.id == id);
  if (activeItem) {
    activeItem.num++;
  }
};
//通过计算属性,计算全选状态
const isAllSelected = computed({
  get() {
    return fruitList.value.every((v) => v.isChecked);
  },
  set(value) {
    fruitList.value.forEach((item) => {
      item.isChecked = value;
    });
  },
});
//0.选中水果列表
const selectedFruitList = computed(() => {
  return fruitList.value.filter((item) => item.isChecked);
});
//1.
const totalPrice = computed(() => {
  //基于选中的个数，计算结果
  return selectedFruitList.value.reduce(
    (acc, item) => acc + item.num * item.price,
    0
  );
});
const totalCount = computed(() => {
  //总个数：找到选中的，累加个数即可
  return selectedFruitList.value.reduce((acc, item) => acc + item.num, 0);
});
</script>

<template>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box">
      <img
        src="https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/sg_top.png"
        alt=""
      />
    </div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div v-if="fruitList.length > 0" class="main">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">
          <!-- 循环渲染 -->
          <div v-for="item in fruitList" :key="item.id" class="tr active">
            <div class="td">
              <input type="checkbox" v-model="item.isChecked" />
            </div>
            <div class="td"><img :src="item.icon" alt="" /></div>
            <div class="td">{{ item.price }}</div>
            <div class="td">
              <!-- 计数器 -->
              <div class="my-input-number">
                <button
                  @click="decreaseFruit(item.id)"
                  :disabled="item.num <= 1"
                  class="decrease"
                >
                  -
                </button>
                <span class="my-input__inner">{{ item.num }}</span>
                <button @click="increaseFruit(item.id)" class="increase">
                  +
                </button>
              </div>
            </div>
            <div class="td">{{ item.num * item.price }}</div>
            <div class="td">
              <button @click="deleteFruir(item.id)">删除</button>
            </div>
          </div>

          <!-- <div class="tr">
            <div class="td"><input type="checkbox" /></div>
            <div class="td"><img src="https://hongm-1312445828.cos.ap-nanjing.myqcloud.com/smt.png" /></div>
            <div class="td">7</div>
            <div class="td">
              <div class="my-input-number">
                <button disabled class="decrease"> - </button>
                <span class="my-input__inner">1</span>
                <button class="increase"> + </button>
              </div>
            </div>
            <div class="td">14</div>
            <div class="td"><button>删除</button></div>
          </div> -->
        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input type="checkbox" v-model="isAllSelected" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box"
            >总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{
              totalPrice
            }}</span></span
          >
          <!-- 结算按钮 -->
          <button class="pay">结算{{ totalCount }}</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div v-else class="empty">🛒空空如也</div>
  </div>
</template>

<style scoped>
@import "./style/inputnumber.css";
@import "./style/index.css";
</style>
